Small tree, the branchlets armed with small to large, solid, paired stipular spines, in youth pubescent to subglabrous, later subglabrous and prominently lenticellate, Leaves moderately large, bipinnate, the pinnae 8-(reportedly) 60 pairs opposite on the rachis, the leaflets many. Petiole about 1 cm. long, pubescent, canaliculate above, bearing a longitudinally extended, crateriform gland slightly above the middle; rachis similar, gland-bearing only at terminal 1 to few rachial nodes; pinnae 2-3 cm. long, eglandular; leaflets linear or linear-oblong, mostly about 3 mm. long and scarcely 1 mm. wide, rounded or obtuse apically, obliquely rounded to subtruncate basally, glabrous or lightly pubescent, only the costa prominent; stipules modified as spines. Inflorescence of axillary, pedunculate heads, solitary or few-fasciculate; peduncles a'bout 1 cm. long, tomentose, ebracteate (except at head); head orbicular, dense, less than 1 cm. in diameter; floral bracts linear-spatulate, about l mm. long. Flowers small; calyx funnelform, about 1 mm. long, tomentulose apically; corolla tubular-funnelform, about 2 mm. long, glabrous except on the prominent lobes; stamens many, free, about 3 mm. long. Legume variable, lineal, reported up to 10 cm. long and 12 mm. wide, subterete, straight or somewhat curved, usually puberulent and glandular.
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